Non-zero radial distortion

In case of visible lens distortion you need to select the respective images in the 1Ds panel and set their Priors in Prior lens distortion to Unknown, which is recommended for high distortion / fish-eye. For more information on priors see Camera Settings / Priors in the Help section built in your RC.

You should also add your camera information into the database, since adding priors helps registering images more precisely. RC allows defining priors for every lens body separately. Visit also: Yellow triangle with an exclamation mark / Do I need to add my camera information into the database? and Where do I add a new camera model info? For more information on lens distortion see also Extending Camera Database in the Help section built in your RC.